Head-rest for dental chairs.



Patented Mar. 4, I902.

e. susu-zv. HEAD REST FOR DENTAL CHAIRS.

(No Model.)

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GIDEON SIBLEYpOF PHILADELPHIA, PENNSYLVANIA.

HEAD-RESTFOR DENTAL CHAIRS.

SPECIFICATION forming part of Letters Patent No. 694,6 dated Marchll, 1902. application filed May 29, 1900. Serial lilo. 18,367. (No model.)

To all whom it may concern:

Be it known that-I, GIDEQN SI-BLEY, a citi- -zen of the United States, residing in the city and county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements inrHead-Rests for Dental Chairs, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

The object of thisinvention is to provide a simple and efficient construction and organization of devices for effecting and maintaining the requisite adjustments of the headrests of dental and other chairs, as will be hereinafter fully described and claimed.

In the drawings,'Figure l is a sectional elevation of a chair-back, the head-rest, and the supporting and locking devices therefor. Fig. 2 is a vertical section, enlarged, through the vertically-adjustable slide or support and the clamping and adjusting devices for the stem of the head-rest; Fig. 3 is a horizontal section as on the line w 00 of Fig. 2. Fig. 4 is a similar section as on the line y y of Fig. 2. V

A represents the back-frame of the chair, and B the supplemental frame therein, which carries the back-rest O. Mounted in a longitudinal guideway in the latter frame is a slide 1,- in the inner side of which, near its lower end, is a recess 2, provided with an inclined wall 3. Within the recess is a roller 4., which is adapted to roll between and against the inclined wall 3 and the opposing wall of the slide. The weight of the slide and its connections is such that the inclined wall exerts suflicient pressure upon the roller to jam it between the slides, and thereby effect their rigid connection; but if the roller be independently depressed the binding action thereof will be overcome to permit the vertical adjustment of the slide. Protruding into the bottom of the recess is a yielding head or plunger 5, upon which the roller rests, the stem of the plungerextending through the lower end of the slide and being maintained normally elevated by an encircling spring 6, which is fitted withina socket 7 in the slide. Extending centrally through the slide isa rod 8, the lower end of which lies adjacent to the top of the roller, so that by the act of depressing the rod the roller will be forced downward thereby against the pressure of the plunger in a manner to release the slide. The rod is held normally elevated by means of an encircling spring 9, which, being contained within a socket 10 in the slide, acts againsta collar or shoulder on the rod. Upon the upper extremity of the rod 8 bears a pin 11, the upper end of-which extends freely through a handle 12, formed. on. or affixed to a headpiece 13 on the slide. On the outer end of the pin is a thumb-piece 14, by means of which the pin may be conveniently depressed to effect the corresponding depression of the rod and, perforce, the release of the slide. Thereupon the slide may be adjusted up or down, as desired, and upon the removal of the pressure from the pin the rod will resume its normal position, and the clamping of the slide in the predetermined position of adjustment -will therefore beautomatically effected. Displacement of the roller within the recess 2 is prevented by a pin 4, which, being affixed to the lateral walls of the recess, extends freely through'an enlarged central aperture in the roller.

Rising from the headpiece is a screw 15, which is fitted to an-internally-threaded pin 16, the latter being supported in and guided by an extension 17 on the slide, to the end that if the handle and, perforce, the head and screw be properly turned the pin will be raised or lowered, as desired. This pin extends through one end of a hollow arm 18, being provided with a head that bears upon the top of the arm. The pin also extends freely through a rock lever 19, which is confined in the arm, said lever being provided on its under side with diametrically opposite teats 20, that bear upon an annulus 21 on theextension. On the arm 18 is a projection 22, that bears upon the upper side of the lever 19. On this arm, near the outer end thereof, is a socket 23, to which is fitted a boss 24L'on one end of an arm 25, such arm being contained in a hollow arm 26.. Fixed in the outer end of arm 26 is a shoe 27, which embraces the end of the arm 25. On this shoe, laterally of the arm 25, are seated, and thereby pivotally supported, the rounded ends of two levers 28, which are inclined downward and pivoted at their opposite extremities to the sides of said arm 25. The respective arms are coupled together by means of a pivot-bolt 29. To an opening in the arm 26, at or near its free end, and to a socket in the adjacent end of the arm 25 is fitted the ball 30 on the shank or stem 31 of the head-rest, to the end that if the latter arm be forced up against the ball the stem and, perforce, the head-rest will be secured in positions of adjustment. This clamping action is attained by forcibly depressing the arm 26, so that the shoe 27 thereof will depress the proximate pivotal ends of the levers 28 similarly to a toggle-joint, and thus jam said arm forcibly against the ball, the operation being effected by forcing down the pin 29 through the medium of the handle and screw-that is to say, if the inner end of the arm 18 be drawn down by the action of the screw the projection 22 thereon bearing upon the rock-arm 19 will depress the outer end of the latter, which end bearing upon the bolt 29 will draw it downward, the head of the bolt thus correspondingly depressing the connected end of the arm 26. By this construction not only will the head-rest be clamped in position, but the several arms themselves will be clamped fixedly in place.

The annulus 21, above referred to, is fitted to a recess or socket in the extension 17, soas to be rotatable thereon, and thus permit the rotation bodily of the head-rest and its connections.

I claim-- 1. In a chair, the combination with a support and'a longitudinally-movable slide therein, of a clamp for said slide, a longitudinallymovable clamp releasing member in said slide, a head rest, adjustable connections therefor between the same and the slide, said connections including a rotary clamping device, a handle on said device, and an independently-movable pin or stem supported by said handle and adapted to actuate the said movable member, substantially as described.

2. In a chair, the combination with a support, and a longitudinally movable slide therein, of a clamp for said slide, a longitudinallymovable clamp-releasing member in said slide, a spring to maintain said member.

normally raised, a head-rest, adjustable connections therefor between the same and the slide, said connections including a rotary clamping device, a handle on said device, and an independently-movable pin or stem sup ported by said handle and adapted to depress: the said clamp-releasing member against the} action of the spring, substantially as described.

3. In a chair, the combination with a support, of a longitudinally-movable slide therein provided with a beveled wall, a movable member interposed between said wall and the 0pposing wall of the support, whereby the weight of the slide and its parts tends to bind said member between the two walls and thereby clamp the slide, a rod for depressing said member, a spring to maintain said rod normally raised, and means for depressing said rod in opposition to the spring, together with a head-rest, and connections between the same and said slide, substantially as described.

4. In a chair, the combination with a support of a longitudinally-movable slide therein provided with abeveled Wall, a movable member interposed between said wall and the opposing wall of the support, whereby the weight of the slide tends to bind said member between the two walls and thereby clamp the slide, and longitudinallymovable means separate and independent of said member adapted to bear upon and shift the same to unclamp the slide, substantially as described.

5. In a chair, the combination with a support, of a longitudinally-1novable slide therein provided with a beveled wall, a roller interposed between said wall and the opposing wall of the support, whereby the weight of the slide tends to bind said roller between the two walls and thereby clamp the slide, and means separate and independent of said roller adapt ed to bear upon and shift the same to un clamp the slide, substantially as described.

6. In a chair, the combination with a support, of a longitudinally-movable slide therein provided with a recess having a beveled wall, a roller contained in said recess and adapted to be forced between said wall and the support by the weight of the slide so as to clamp the slide, and means separate and independent of said roller adapted to bear upon and shift the same to unclamp the slide, substantially as described.

7. In a chair, the combination with a support, of a longitudinally-movable slide therein provided with a recess having a beveled wall, a roller contained in said recess andadapted to be forced between said wall and the sup port by the weight of the slide so as to clamp the slide, an independent vertically-movable rod to bear upon and shift said roller, and means for operating said rod, substantially as described.

8. ha chair, the combination with a'support, of a longitudinally-movable slide therein provided with a recess having a beveled wall, a roller contained in said recess and adapted to be forced between said wall and the support by the weight of the slide so as to clamp the slide, a yielding support for said roller below the recess, and means for depressing the roller and the support so as to unclamp the slide, substantially as described.

9. In a chair, the combination of the head- 1 rest stem, the clamping-arms therefor, an in-' clined toggle-lever pivo'tally connected with said arms to effect the clamping action there of, and means for operating said arms, substantially as described.

10. In a chair, the combination of the headrest stem, the clamping-arms therefor, an inclined lever pivotally connected with said arms to efiect the clamping action thereof, an In testimony whereof I have hereunto afunderlyingarmuponwhich oneof saidclampfixed my signature in the presence of two 7 ing-arms is pivotally mounted, a rock-lever, subscribing witnesses.

a pivot-bolt connecting said rock-lever and GIDEON SIBLEY. 5 arms, a support for the fulcrum of the rock- Witnesses:

'lever, and means for operating'said under- W. S.'BUCKINGHAM,

lying arms, substantially as described. ANDREW V. GROUPE. 

